#657C9F
Closest named color: Stormy Blue (#507B9C). oklch(58.2% 0.061 258.6), rgb(101, 124, 159).
Aa
Black text reads best on this color (4.93:1).
About this color
#657C9F is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.061 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.027 away. Black text reads best on it, at 4.93:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.93:1 |
| White text | 4.25:1 |
Values
| HEX | #657C9F |
| RGB | rgb(101, 124, 159) |
| HSL | hsl(216, 23%, 51%) |
| OKLCH | oklch(58.2% 0.061 258.6) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #657C9F | 4.25:1 | AA large text | Lc -74.9 | Content text, not long reading |
| Black text on #657C9F | 4.93:1 | AA | Lc 34.7 | Non-text elements, placeholder text |
| #657C9F text on white | 4.25:1 | AA large text | Lc 69.4 | Content text, not long reading |
| #657C9F text on black | 4.93:1 | AA | Lc -32.3 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D3DAE3
oklch(88.6% 0.015 254.6)
-
Step 300
300
#B6C1D3
oklch(80.8% 0.028 260.3)
-
Step 400
400
#90A2BC
oklch(70.7% 0.043 257.5)
-
Step 500
500
#758BAC
oklch(63.2% 0.056 258.3)
-
Step 600
600 (this color)
#657C9F
oklch(58.2% 0.061 258.6)
-
Step 700
700
#4D6281
oklch(49.2% 0.056 258)
-
Step 800
800
#3F5069
oklch(42.7% 0.047 257.9)
-
Step 900
900
#364255
oklch(37.7% 0.036 259.5)
-
Step 950
950
#202732
oklch(27.1% 0.023 259.3)
#657C9F with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #707EA1 | 0.017 |
| Deuteranopia (no green cones) | #69789E | 0.012 |
| Tritanopia (no blue cones) | #538388 | 0.052 |
| Achromatopsia (no color) | #7B7B7B | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #657C9F
#657C9F
oklch(58.2% 0.061 258.6)
- #8E7751
#8E7751
oklch(58.2% 0.061 79.7)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #657C9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.027
- Grey Blue #647D8E ΔE 0.028
- Off Blue #5684AE ΔE 0.030
- Dusty Blue #5A86AD ΔE 0.031
- Slate Gray #708090 ΔE 0.032
- Lavender Gray #7E7F9A ΔE 0.037
- Cerulean #457B9D ΔE 0.037
- Steel #738595 ΔE 0.040
Use #657C9F in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.